Nonclassical rotational behavior at the vicinity of the {lambda} point
- Physics Division, Faculty of Education, Kochi University, Akebono-cho, 2-5-1, Kochi 780 (Japan)
The rotational property of a quantum liquid at the vicinity of the {lambda} point T{sub {lambda}} is examined. In a liquid helium 4 just above T{sub {lambda}}, under the strong influence of Bose statistics, the coherent many-body wave function grows to an intermediate size between a macroscopic and a microscopic one, which is of a different nature from the thermal fluctuations. It must affect the rotational properties, such as the moment of inertia. Beginning with the bosons without the condensate, we make a perturbation calculation of its susceptibility with respect to the repulsive interaction, and examine how, with decreasing temperature, the growth of the coherent wave function gradually changes the rotational behavior of a liquid: The moment of inertia slightly decreases just above T{sub {lambda}}. This means that at the vicinity of T{sub {lambda}}, the mechanical superfluid density does not always agree with the thermodynamical one. We compare the result to the experiment by Hess and Fairbank [Phys. Rev. Lett. 19, 216 (1967)]. An interpretation of the shear viscosity just above T{sub {lambda}} is given from this viewpoint.
- OSTI ID:
- 20853485
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 74, Issue 5; Other Information: DOI: 10.1103/PhysRevB.74.054501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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